Seasonal variation of shallow-to-deep convection transition and its link to the environmental conditions over the Central Amazon: Shallow-to-Deep Convection Transition
Abstract
This study aims to characterize the seasonal variation of the shallow-to-deep convection transition and understand how environmental conditions impact the behavior of this transition using data collected from the Observations and Modeling of the Green Ocean Amazon (GOAmazon) field campaign in the Central Amazon (Manaus). The diurnal cycle of the rain/cloud fraction shows that the wet season has more extensive shallow convection before the transition to deep convection with larger fractional coverage and rainfall; deep convection in the transition season is more intense and has higher vertical extension and a stronger updraft. Surface meteorology, atmospheric moisture, instability, and wind shear are contrasted for the shallow/congestus convection (SC) cases and the locally formed shallow-to-deep convection transition (LD) cases. The comparisons suggest that occurrence of the LD is generally promoted under the conditions of high atmospheric moisture and instability but has a weaker dependence on wind shear. The relative importance of these environmental controls also varies in different seasons: The dry and transition seasons require a deeper moist layer from the boundary layer to midtroposphere than the wet season; convective available potential energy (CAPE) is higher during the transition season, but it is a less important factor for shallow-to-deep convection transition thanmore »
- Authors:
-
[1];
[3];
[4]
- Univ. of Texas, Austin, TX (United States); Peking Univ., Beijing (China)
- Univ. of Texas, Austin, TX (United States); Univ. of California, Los Angeles, CA (United States)
- Centro Nacional de Monitoramento e Alertas de Desastres Naturais (CEMADEN), São Paulo (Brazil)
- Peking Univ., Beijing (China)
- Publication Date:
- Research Org.:
- Univ. of Texas, Austin, TX (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1532988
- Grant/Contract Number:
- SC0011117
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research: Atmospheres
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 5; Journal ID: ISSN 2169-897X
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; Meteorology & Atmospheric Sciences
Citation Formats
Zhuang, Yizhou, Fu, Rong, Marengo, José A., and Wang, Hongqing. Seasonal variation of shallow-to-deep convection transition and its link to the environmental conditions over the Central Amazon: Shallow-to-Deep Convection Transition. United States: N. p., 2017.
Web. doi:10.1002/2016jd025993.
Zhuang, Yizhou, Fu, Rong, Marengo, José A., & Wang, Hongqing. Seasonal variation of shallow-to-deep convection transition and its link to the environmental conditions over the Central Amazon: Shallow-to-Deep Convection Transition. United States. https://doi.org/10.1002/2016jd025993
Zhuang, Yizhou, Fu, Rong, Marengo, José A., and Wang, Hongqing. Sun .
"Seasonal variation of shallow-to-deep convection transition and its link to the environmental conditions over the Central Amazon: Shallow-to-Deep Convection Transition". United States. https://doi.org/10.1002/2016jd025993. https://www.osti.gov/servlets/purl/1532988.
@article{osti_1532988,
title = {Seasonal variation of shallow-to-deep convection transition and its link to the environmental conditions over the Central Amazon: Shallow-to-Deep Convection Transition},
author = {Zhuang, Yizhou and Fu, Rong and Marengo, José A. and Wang, Hongqing},
abstractNote = {This study aims to characterize the seasonal variation of the shallow-to-deep convection transition and understand how environmental conditions impact the behavior of this transition using data collected from the Observations and Modeling of the Green Ocean Amazon (GOAmazon) field campaign in the Central Amazon (Manaus). The diurnal cycle of the rain/cloud fraction shows that the wet season has more extensive shallow convection before the transition to deep convection with larger fractional coverage and rainfall; deep convection in the transition season is more intense and has higher vertical extension and a stronger updraft. Surface meteorology, atmospheric moisture, instability, and wind shear are contrasted for the shallow/congestus convection (SC) cases and the locally formed shallow-to-deep convection transition (LD) cases. The comparisons suggest that occurrence of the LD is generally promoted under the conditions of high atmospheric moisture and instability but has a weaker dependence on wind shear. The relative importance of these environmental controls also varies in different seasons: The dry and transition seasons require a deeper moist layer from the boundary layer to midtroposphere than the wet season; convective available potential energy (CAPE) is higher during the transition season, but it is a less important factor for shallow-to-deep convection transition than in other seasons; LD only has significantly larger wind shears than SC during the dry season.},
doi = {10.1002/2016jd025993},
journal = {Journal of Geophysical Research: Atmospheres},
number = 5,
volume = 122,
place = {United States},
year = {Sun Jan 22 00:00:00 EST 2017},
month = {Sun Jan 22 00:00:00 EST 2017}
}
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Works referencing / citing this record:
Recent changes in the precipitation-driving processes over the southern tropical Andes/western Amazon
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Overview: Precipitation characteristics and sensitivities to environmental conditions during GoAmazon2014/5 and ACRIDICON-CHUVA
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